Some AVFoundation source files should be in platform-specific directories
https://bugs.webkit.org/show_bug.cgi?id=66352

Moved platform/graphics/avfoundation/MediaPlayerPrivateAVFoundationCF.* files to platform/graphics/avfoundation/cf,
and moved platform/graphics/avfoundation/MediaPlayerPrivateAVFoundationObjC.* files to platform/graphics/avfoundation/objc/.

While I was at it, added svn:eol-style property to the MediaPlayerPrivateAVFoundationObjC.* files.

Also, for some reason, Visual Studio decided to re-sort a couple files in \inspector\front-end\ in WebCore.vcproj, even though
I just re-sorted the project in r93215.